Problem: Exactly equal amounts (in moles) of gas A and gas B are combined in a 1-L container at room temperature. Gas B has a molar mass that is twice that of gas A.Which of the following is true for the mixture of gases?a) The molecules of gas B have greater kinetic energy than those of gas A. b) Gas B has a greater partial pressure than gas A. c) Gas B makes a greater contribution to the average density of the mixture than gas A.d) The molecules of gas B have a greater average velocity than those of gas A.

FREE Expert Solution

Molar mass of B > Molar Mass of A 

  • MM B = 2(MM A)
  • Average kinetic energy → dependent on absolute temperature (not mass)
  • Average velocity → inversely proportional to molar mass of gas 
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Problem Details

Exactly equal amounts (in moles) of gas A and gas B are combined in a 1-L container at room temperature. Gas B has a molar mass that is twice that of gas A.


Which of the following is true for the mixture of gases?


a) The molecules of gas B have greater kinetic energy than those of gas A. 

b) Gas B has a greater partial pressure than gas A. 

c) Gas B makes a greater contribution to the average density of the mixture than gas A.

d) The molecules of gas B have a greater average velocity than those of gas A.

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